import time
def ding():
    print("当")
    time.sleep(1)
    print("当")
    time.sleep(1)
    print("当")
    time.sleep(1)
    print("当")
    time.sleep(1)
    print("当")
    print()
ding()
time.sleep(3)
ding()
time.sleep(3)
ding()
time.sleep(3)
ding()
time.sleep(3)
ding()